**» Peritheda ccspitose (or sometimes simply 

 gregarious,) connected at base by a more 

 or less distinct stromatic layer, • Gncurbitarieae. 

 B. Peritliecia included in a stroma (Compound Sphaeriae.) 



Stroma effused, pulvinate or tuberculiform; perithecia 

 buried in the stroma, their ostiola (typicalij) 

 convergenr and erumpent in a central fascicle. Valseae. 



Stroma valgoid, pulvinate, conical or hemispherical, 

 often inconspicuous or wanting, accompanied 

 mostly by a conidial stroma, - Melanconideae. 



Stroma various; pulvinate, tuberculiform, etc., 

 erumpent or superficial. Spermatia and 

 stylospores produced in cavities within the 

 perithecial stroma. • . (1,) Melogrammeae. 



Stroma effused, scutellate, pulvinate or tuberculiform. 

 Perithpcia monostichous or polystichous, with 

 their ostiola separately erumpent. • (2.) Diatrypeae. 



Stroma various; upright, dendroid, pulvinate, or 



globose; mostly carbonaceous and superficial, 



black, or becoming black. Sporidia; brown or" 



black. ... - ' , (3.) Xylarieae. 



SUBORDER DOTHlDEACBAB. 



Stroma pulvinate or effused, coriaceous, or subcarbon- 

 aceous; perithecia reduced to mere cells or ' 

 cavities in the stroma. Sporidia hyaline, 

 yellowish or brown - Dothideaceae. 



SUBORDER HYSTERIACEAK- 



Stroma none. Perithecia simple, erumpent-Superficial, 

 oblong or linear, membranaceous, coriaceous or 

 carbonaceous, becoming black, opening by a 

 • narro*, longitudinal cleft. • ~ ITysteriaceae.f 



1. Includes Boiryosp/meyia, Afyrmaecium, Endothia, Melogramina, 



and yalsaria. (pp. 546 564.) 



2. Includes Diatrype, Anthostoma and DiatrypMa (pp. 565-595.) 



The diagfnoses of these two families were omitted in theit ptoper place 

 in tire N. Am. Pyrenomycetes 



3. This family should precede Dothideaceae iu the syslematip arrangement, 



.' ,, fThis suborder doesnot properly belong loHhe Pyrenornycetes but is included here lor 

 the present as a matter of convenience. 



